SIMBAD references

2013ApJ...776..126C - Astrophys. J., 776, 126 (2013/October-3)

Discovery of four high proper motion L dwarfs, including a 10 pc L dwarf at the L/T transition.

CASTRO P.J., GIZIS J.E., HARRIS H.C., MACE G.N., KIRKPATRICK J.D., McLEAN I.S., PATTARAKIJWANICH P. and SKRUTSKIE M.F.

Abstract (from CDS):

We discover four high proper motion L dwarfs by comparing the Wide-field Infrared Survey Explorer (WISE) to the Two Micron All Sky Survey. WISE J140533.32+835030.5 is an L dwarf at the L/T transition with a proper motion of 0.85±0.''02/yr, previously overlooked due to its proximity to a bright star (V ~ 12 mag). From optical spectroscopy we find a spectral type of L8, and from moderate-resolution J band spectroscopy we find a near-infrared spectral type of L9. We find WISE J140533.32+835030.5 to have a distance of 9.7±1.7 pc, bringing the number of L dwarfs at the L/T transition within 10 pc from six to seven. WISE J040137.21+284951.7, WISE J040418.01+412735.6, and WISE J062442.37+662625.6 are all early L dwarfs within 25 pc, and were classified using optical and low-resolution near-infrared spectra. WISE J040418.01+412735.6 is an L2 pec (red) dwarf, a member of the class of unusually red L dwarfs. We use follow-up optical and low-resolution near-infrared spectroscopy to classify a previously discovered fifth object WISEP J060738.65+242953.4 as an (L8 Opt/L9 NIR), confirming it as an L dwarf at the L/T transition within 10 pc. WISEP J060738.65+242953.4 shows tentative CH4 in the H band, possibly the result of unresolved binarity with an early T dwarf, a scenario not supported by binary spectral template fitting. If WISEP J060738.65+242953.4 is a single object, it represents the earliest onset of CH4 in the H band of an L/T transition dwarf in the SpeX Library. As very late L dwarfs within 10 pc, WISE J140533.32+835030.5 and WISEP J060738.65+242953.4 will play a vital role in resolving outstanding issues at the L/T transition.

Abstract Copyright: ∼

Journal keyword(s): brown dwarfs - infrared: stars - proper motions - stars: distances - stars: individual (WISE J040137.21+284951.7, WISE J040418.01+412735.6, WISEP J060738.65+242953.4, WISE J062442.37+662625.6, WISE J140533.32+835030.5) - stars: late-type

Simbad objects: 39

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